问题
选择题
When and where the meeting will be held____.[ ]
A. has decided
B. had decided
C. has been decided
D. is decided
答案
答案：C
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When and where the meeting will be held____.[ ]
A. has decided
B. had decided
C. has been decided
D. is decided
答案：C
如图所示的密闭装置，一株植物和一支蜡烛放在透明钟罩的底部，假如减少钟罩中的CO2，同时增加钟罩中的O2，点燃蜡烛，蜡烛燃烧了一分钟后自行熄灭．三天后，蜡烛被一个电装置重新点燃，并在熄灭前燃烧了一分钟．上述实验回答了下列哪一个问题（ ）
| A．是否植物所有的部分都吸收二氧化碳，释放出氧 |
| B．植物是否需要阳光才吸收二氧化碳和释放氧 |
| C．植物吸收的二氧化碳的数量是否大于释放的氧的数量 |
