问题 单项选择题

在梯度模式下得出最佳反应条件,并以此条件在标准模式下单独做,但结果却不如人意,最有可能的原因是()

A.样品孔温度与设定温度不一致

B.样品孔间的温度有差异

C.样品孔位置的边缘效应较高

D.升降温速度不够快

E.不同模式温度特性有差异

答案

参考答案:E

完形填空

阅读表达。(共5小题;每小题2分,共10分。)

Counterfeit (假的) medicines are a widespread problem in developing countries. Like other counterfeits, they look like real products. But counterfeit drugs may contain too little or none of the active ingredients (原料) of the real thing.

People do not get the medicine they need. And in some cases the counterfeits cause death. Twenty children in Bangladesh died last year after being given acetaminophen (醋氨粉). The medications contained ingredients that looked, smelled and tasted like the real thing. The medicine was produced by a local drug company that used a dangerous substitute to save money.

The problem with counterfeit medicines is especially bad in Africa, Asia and Latin America. The W. H. O. estimates that up to thirty percent of the medicines on sale in many of those countries are counterfeit.              . The W. H. O. says counterfeits make up less than one percent of the illegal drug market in countries like the United States, Canada, Japan, and New Zealand.

But the agency also says as much as fifty percent of the medicine sold on the Internet is counterfeit.

Much is being done to fight counterfeit drugs. Several companies are developing ways to make counterfeits easier to identify. And there are existing methods, like a machine that can quickly identify chemicals in pills to confirm if the pills are real. Other ideas include things like special tracking codes for drug packages. People could send a text message with the code and get a message back proving that what they bought is listed in a database. Some drug makers and other companies put three-dimensional images called holograms (条形码) on their products as a security device.

小题1: What advice can we get from Paragraph 4? (no more than 8words)

小题2: What is the main idea of the last paragraph? (no more than 10 words)

小题3: Complete the following statement with proper words. (no more that 4 words)

A local drug company produced counterfeit medicines by using dangerous substitutes        .

小题4: Fill in the blank in Paragraph 3 with a proper sentence. (no more than 10 words)

小题5: What does the underlined word “they” in Paragraph 1 refer to? (no more than 3 words)

单项选择题