问题 填空题

合成氨工业中选择20MP~50MP的压强,而没有选择更高的压强,理由是            ;硫酸工业中选择475℃的温度,而不是选择常温,理由是                         。在吸收塔中三氧化硫的吸收剂是         ,选择该吸收剂的优点是             

答案

压强增大,动力及设备要求增大,成本提高;

该温度是催化剂的活性温度。

98.3%硫酸,不会形成酸雾,易于SO3的吸收

单项选择题
完形填空

With the holidays coming up, lots of people will be having parties. Want to make sure you’re a perfect host or guest(客人)? Now it’s a good time to brush up on your party manners.

When inviting guests to your party,  send invitations to their homes instead of passing them out at school. This way, you won’t hurt the feeling of classmates you didn’t invite.

<83>Wait for all your guests to arrive before starting any activities. If people at the party don’t know each other, make sure you introduce everyone.

If your guests bring gifts for you, thank each gift----giver as you open his/her present. After the party, be sure to send a hand-written thank-you card to each guest, telling them how much you appreciate their gifts.

When you receive a invitation to a party, be sure to let the host know whether you can come.

Arrive on time. Bring a gift to a birthday party. <84>If it’s a holiday party, ask the host if there’s anything you can bring. Adults often bring a desert or a bottle of wine to a party, even when the host tells them that he/she doesn’t need anything. Young people don’t have to do this, but it’s always polite to ask.

Be friendly to the other guests. Remember to say “Please” and “Thank you”! When you leave, thank the host for the party.

根据短文内容简要回答问题。

小题1: If you invite guests to your party, how should you send your invitation?

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小题2: If you receive an invitation to a party, what should you do first?

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(二)将短文中划线的句子翻译成汉语。

小题3:___________________________________________________________________

小题4:___________________________________________________________________

(三)请根据短文内容拟一个标题。

小题5:___________________________________________________________________