Mr. Smith said he would give us a talk t

搜题请搜索小程序“爱下问搜题”

问题选择题

Mr. Smith said he would give us a talk today. Now it is already ten o'clock, but he hasn't ________

yet. [ ]

A. put up

B. looked up

C. made up

D. shown up

答案

答案：D

选择题

— Who’s that boy reading in the garden? Is it David?

— It ____________ be David. I saw him in the classroom just now．

A．must

B．can’t

C．may

D．shouldn’t

选择题

已知短周期元素的离子：_aA²⁺、_bB⁺、_cC^3-、_dD^-都具有相同的电子层结构，则下列叙述正确的是（）

A．原子半径A＞B＞D＞C

B．原子序数d＞c＞b＞a

C．离子半径C＞D＞B＞A

D．单质的还原性A＞B＞D＞C