桦木科（）是中国东北林区的主要阔叶树种之一，枝叶扶疏，姿态优

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问题填空题

桦木科（）是中国东北林区的主要阔叶树种之一，枝叶扶疏，姿态优美；尤其是树干修直，洁白雅致，十分引人注目。

答案

参考答案：白桦

单项选择题

心脏本身的供应血管是

A．头臂干

B．左右颈总动脉

C．左右锁骨下动脉

D．左右冠状动脉

E．胸主动脉

问答题

Directions: Write an essay of 160-200 words based on the following drawing. In your essay, you should

1) describe the photos briefly,

2) explain its intended meaning, and

3) support your view with an example/examples.

You should write neatly on ANSWER SHEET 2.