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问题 多项选择题

有效教学的评价标准包括（）。

A、充分的准备

B、正确的目标

C、科学的组织

D、结构清晰

E、关注学生

答案

参考答案：A, B, C, D, E

选择题
Ever since the financial crisis _____, many workers _____ from their jobs.

A. broke out; were laid off
B. has broken out; were laid off
C. had broken out; had been laid off
D. broke out; have been laid off
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单项选择题

在蚯蚓的循环系统中，血液流动的方向是（）。

A、背血管→心脏→腹血管

B、腹血管→心脏→背血管

C、心脏→背血管→腹血管

D、背血管→腹血管→心脏
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