射线有______端点，直线______端点，线段有______端点．把线段向两

动词填空  用所给动词的适当形式填空。

1. My father usually ______(watch) TV in the evening.

2. Look. The students ______(play) basketball over there.

3. We enjoy ______(live) in the city very much.

4. —______ they ______(go) to the beach yesterday?

    —No, they didn't. They _____(go) to the park.

5. I ______(be) born on July 23rd, 1991.

6. Charles Smith started ______(hiccup) in 1922.

7. Lucy ______(invite) her friends to her party next Sunday.

有一电池，两极间电压为1.5V，当把它的正极接地时，负极的电位将是______V。

焦炉煤气中CO含量为（）。

A、55％～60％

B、5％～8％

C、23％～28％

D、2％～4％

11个月男孩，发热7d，气促、面色苍白1d，心率 56/min，律略不齐，心音低钝。心电图示高度房室传导阻滞

有助于诊断的实验室检查是

A．血电解质测定

B．血清CK-MB

C．大便病毒分离

D．血液病毒分离

E．血培养