A ___may consist of a single___morpheme as in "iron" or of two ___morphemes as in a compound like "handcuff". A: stem, root, root B: root, stem, stem C: stem, stem, root D: root, root, stem

A prefix is an affix which appears ____. A: after the stem B: efore the stem C: in the middle of the stem D: elow the stem

A prefix is an affix which appears ______.（ ） A: in the middle of the stem B: below the stem C: before the stem D: after the stem

STEM教育中STEM是指 、、、

下列选项中，哪个是“胚胎干细胞”的正确的英文翻译（ ）。 A: multipotent stem cell B: Adult-derived Stem Cell C: Totipotent stem cell D: Embryonic Stem Cell

【植】以下细胞中发育潜能最大的是()。 A: Totipotent<br/>stem cell B: Pluripotent<br/>stem cell C: Oligopotent<br/>stem cell D: Unipotent<br/>stem cell

STEM stands for .

STEM stands for00a000a000a000a000a000a000a000a000a000a000a000a000a000a000a0 .

干细胞(stem cell)

News Report 3Questions 5 to 7 are based on the news report you have just heard. A: Raise the salary of STEM jobs. B: Force students to learn STEM. C: Pay little attention to STEM. D: Invest more money in the education of STEM.