Why sharks are useful for humans.* A. Their tasty meat. B. The principle of their defense system against disease. G. Their solid skin. D. The principle of their birth modes.
A. Their solid skin.
B. The principle of their birth modes.
C. The principle of their defense system against disease.
D. Why sharks are useful for humans.*
E. Their tasty meat.
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What prompted the conversation
A. The man wants to place a classified ad in the newspaper.
B. The woman wants to find an apartment.
C. The man wants to pay for a newspaper subscription.
D. The woman wants to fill out an application for employment.
疏水胶体的性质中不正确的是
A. 存在强烈的布朗运动
B. 具有双分子层
C. 具有聚结不稳定性
D. 不能形成凝胶
E. 具有Tynclall现象
下列关于气雾剂的特点不正确的是
A. 具有速效和定位作用
B. 由于容器不透光、不透水，所以能增加药物的稳定性
C. 药物可避免胃肠道的破坏和肝脏首过作用
D. 可以用定量阀门准确控制剂量
E. 由于起效快，适合心脏病患者适用
About ______ people were killed in the country's townships by the week- end.
A. three
B. thirteen
C. forty-six
D. sixty-four
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