头略似马头，躯干部呈七棱形体，躯干表面上有瓦愣形节纹并具短棘的是

混凝土的强度等级是指混凝土的抗压强度具有的保证率为(  )。

整个教育制度的主体是

Passage1

In many of the developing countries in Africaand Asia, the population is growing fast. The reason for this is simple: Womenin these countries have a high birth rate - from 3.0 to 7.0 children per woman.The majority of these women are poor, without the food or resources to care fortheir families. Why do they have so many children? Why don't they limit thesize of their families? The answer may be that they often have no choice. Thereare several reasons for this.

Onereason is economi

In atraditional agricultural economy, large families are helpful. Having morechildren means having more workers in the fields and someone to take care ofthe parents in old age. In an industrial economy, the situation is different.Many children, do not help a family; instead, they are an expense. Thus,industrialization has generally brought down the birth rate. This was the casein Italy, which was industrialized quite recently and rapidly. In the earlypart of the twentieth century, Italy was a poor, largely agricultural countrywith a high birth rate. After World WarⅡ, Italy's economy was rapidly modernized and industrialize

By theend of the century, the birth rate had dropped to 1. 3 children per woman, theworld's lowest.

However,the economy is not the only important factor that influences birth rate. SaudiArabia, for example, does not have an agriculture-based economy, and it has oneof the highest per capita incomes in the worl

Nevertheless,it also has a very high birth rate. Mexico and Indonesia, on the other hand,are poor countries, with largely agricultural economies, but they have recentlyreduced their population growth.

Clearly,other factors are involve

Themost important of these is the condition of women. A high birth rate almostalways goes together with lack of education and low status for women. Thiswould explain the high birth rate of Saudi Arabia. There, the traditionalculture gives women little education or independence and few possibilitiesoutside the home. On the other hand, the improved condition of women in Mexico,Thailand, and Indonesia explains the decline in birth rates in these countries.Their governments have taken measures to provide more education andopportunities for women.

Anotherkey factor in the birth rate is birth control. Women may want to limit theirfamilies but have no way to do so. In countries where governments have madebirth control easily available and inexpensive, birth rates have gone down.This is the case in Singapore, Sri Lanka, and India, as well as in Indonesia,Thailand, Mexico, and Brazil. In these countries, women have also been providedwith health care and help in planning their families.

Thesetrends show that an effective program to reduce population growth does not haveto depend on better economic conditions.3 It can be effective if it aims tohelp women and meet their needs. Only then, in fact, does it have any realchance of success.       (495 words)

According to this passage, Italy today is an example of an _______.

治疗抗肿瘤药物引起的恶心、呕吐等不良反应，可以选用的止吐药是（   ）

不符合面神经麻痹表现的是

在我国，某客户于6月6日通过期货公司买入5手豆油期货合约，成交价为10250元/吨。当日结算价为10210元/吨，期货公司要求的交易保证金比列为10%。该客户当日交易保证金占用为（  ）元。（豆油期货交易单位为10吨/手，不计手续费等费用）

关于花岗石特性的说法，错误的是（     ）。

与青霉素合用可延缓青霉素排泄的是（）。

2019年6月，某煤矿进行矿井瓦斯等级鉴定，测得矿井总回风量为10000m³/min，总回风流中的平均瓦斯浓度为0.20%。当月平均日产煤量为4000t，该煤矿6月瓦斯涌出总量是（）m³。

下列不属于体育教学组织常见的心理学分组形式的是（ ）。