3、企业的现金都有一定的限额，这一限额是由企业根据自己单位的实际情况自行制定的。（）
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I’ve ______ the habit of walking through the park.
A. gotten into
B. gotten in
C. gotten off
D. gotten down
_______, he can quickly find out what’s wrong with the machine.
A. having been well trained
B. Having well trained
C. To be well trained
D. To have been well trained
核仁合成和加工的RNA是()
A.tRNA
B.rRNA
C.mRNA
D.snRNA
E.miRNA
组蛋白能够进入细胞核,是因为其上有()
A. 亲核蛋白
B. 核输入信号
C. 核输入受体
D. 核输出信号
E. 核输出受体
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